Abstract
In this paper, the authors study spin dynamics in the noncollinear antiferromagnet Mn3Sn. They derive an effective low-energy model based on the cluster multipole expansion of the magnetic structure and show that the cluster multipole degrees of freedom dominate its low-energy dynamics. They also show that Mn3Sn has a high domain wall velocity without a Walker breakdown and a stable uniform precession mode with a tunable frequency.
Highlights
Cluster multipole dynamics in noncollinear antiferromagnetsTakuya Nomoto 1,* and Ryotaro Arita 1,2 1Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
In the field of spintronics, spin manipulation based on an antiferromagnet (AFM) has attracted much attention because of its potential advantages over a ferromagnet (FM) [1,2,3,4,5,6,7]
Our results indicate that Mn3Sn has preferable properties for applications to a racetrack memory and a spin torque oscillator, and is a promising candidate for spintronics devices by using the multipole degrees of freedom
Summary
Takuya Nomoto 1,* and Ryotaro Arita 1,2 1Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. A systematic framework to investigate the spin dynamics in a noncollinear antiferromagnet is proposed. Taking Mn3Sn as a representative example, we derive an effective low-energy model based on the multipole expansion of the magnetic structure, and investigate the uniform precession and the domain wall dynamics. We show that the solution for the effective model accurately reproduces the numerical calculation of the Landau-Lifshitz-Gilbert equations. Our results indicate that Mn3Sn has preferable properties for applications to a racetrack memory and a spin torque oscillator, and is a promising candidate for spintronics devices by using the multipole degrees of freedom
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